lepture/flask-oauthlib
YOU SHOULD USE https://github.com/lepture/authlib
miguelgrinberg/Flask-HTTPAuth
Simple extension that provides Basic, Digest and Token HTTP authentication for Flask routes
dimmg/flusk
Boilerplate API on how to structure big Flask applications (includes SQLAlchemy, Docker, nginx)
alexferl/flask-simpleldap
LDAP authentication extension for the Flask web framework
FedericoCeratto/bottle-cork
Authentication module for the Bottle and Flask web frameworks